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<body style="timeline-scope: --t1,--t2,--t3,--t4,--t5,--t6;">
  <nav>
    <a href="#e1" style="--s: --t1">一、标题一</a>
    <a href="#e2" style="--s: --t2">二、标题二</a>
    <a href="#e3" style="--s: --t3">三、标题三</a>
    <a href="#e4" style="--s: --t4">四、标题四</a>
    <a href="#e5" style="--s: --t5">五、标题五</a>
    <a href="#e6" style="--s: --t6">六、标题六</a>
  </nav>
  <h1>CSS 电梯导航 锚点定位</h1>
  <div class="content" style="--s: --t1">
    <h2 id="e1">一、标题一</h2>
    <section>
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    </section>
  </div>
  <div class="content" style="--s: --t2">
    <h2 id="e2">二、标题二</h2>
    <section>
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    </section>
  </div>
  <div class="content" style="--s: --t3">
    <h2 id="e3">三、标题三</h2>
    <section>
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    </section>
  </div>
  <div class="content" style="--s: --t4">
    <h2 id="e4">四、标题四</h2>
    <section>
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    </section>
  </div>
  <div class="content" style="--s: --t5">
    <h2 id="e5">五、标题五</h2>
    <section>
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    </section>
  </div>
  <div class="content" style="--s: --t6">
    <h2 id="e6">六、标题六</h2>
    <section>
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    </section>
  </div>
</body>
<style>
  html, body{
    padding: 0 15px;
    scroll-behavior: smooth;
  }

  h2{
    margin: 0;
    padding: .8em 0;
    scroll-margin: 20px;
  }

  .content {
    view-timeline-name: var(--s);
    view-timeline-inset: 50%; /*完整写法是 50% 50%*/
  }

  nav{
    position: fixed;
    top: 15px;
    right: 15px;
    background: #fff;
    padding: 10px 0;
    border-radius: 4px;
    overflow: hidden;
  }

  nav>a{
    position: relative;
    display: block;
    line-height: 2;
    padding: 0 15px;
    font-size: 14px;
    color: #191919;
    text-decoration: none;
    animation: active;
    animation-timeline: var(--s);
    border-left: 4px solid transparent;
  }

  nav>a:hover{
    background-color: #d5d5d54a;
  }

  @keyframes active {
    0%, 100% {
      color: #6f00ff;
      border-color: #6f00ff;
    }
  }

  section{
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
  }

  section span{
    width: 30%;
    height: 100px;
    border-radius: 4px;
    background-color: #E4CCFF;
  }
</style>